$x\cdot x\cdot x\cdot x\cdot y\cdot y$
$\left(x+\sqrt{2}y+z\right)^2$
$2.63+1.80+3.67$
$1x^2-14x+49$
$20.3\frac{3}{4}$
$\frac{x+4}{x+1}>x$
$2\sin\left(\frac{12}{13}\right)\cos\left(\frac{5}{13}\right)$
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